this is just one article, and it is exploring just one facet of a complicated thing.

if you really want to understand this, you shouldn't go sorting through periodicals, but should just pick up a textbook in meteorology that explains how the polar vortex is a solar phenomenon - it is essentially a swirling mass of cold air that is kept in check by solar radiation, and that both tightens up when radiation is increased and starts to break apart and expand when solar radiation decreases. as the earth moves around the sun in a roughly elliptical orbit, on an angle, that creates fluctuations in the amount of radiation hitting the earth, an expansion (and subsequent contraction) is something that happens every year, and we've known about it for decades. it's in the textbooks...you don't need need recent periodicals....it's well understood, already...

so, i'm not citing this - which is a recent paper from a very good source - to prove any specific point.

what i'm doing is trying to direct you to what the actual scientific community - not the liberal media - is considering right now to try and understand what is happening in the northern hemisphere, specifically.

this is a starting point for further research, not an authoritative end point.

https://link.springer.com/article/10.1007/s13351-018-7101-2